About 1500 litres of diesel have poured into the river at the Sunshine Coast’s main harbour.
The Pollution Hotline received a call at 10.45am on Tuesday, reporting a spill at a refuelling station.
It resulted in diesel being released into the Mooloolah River at the Mooloolaba Harbour.
Officers from the Department of Environment, Tourism, Science and Innovation investigated and were advised that the spill occurred after a broken pump handle failed to shut off.
DETSI executive director Brad Wirth said the department would continue to monitor the spill to assess the impacts to the environment.
“Our officers quickly attended the site less than an hour after the spill was reported to us and investigated the incident,” he said.

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“The diesel was already widely dispersed with the outgoing tide.
“We will continue to work with Maritime Safety Queensland and Sunshine Coast Council to ensure any potential impacts of the spill are minimised.
“If you ever find yourself in this situation where fuel is leaking, it is important to let the refuelling station know so they can activate the emergency stop.”
To report pollution incidents to the department please call the Pollution Hotline on 1300 130 372 or complete an online environmental report.